ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Density of the System LiF—KF—K₂NbF₇

M. Chrenková, V. Daněk, and A. Silný

Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava

Abstract: The density of the melts in the system LiF-KF-K₂NbF₇ has been measured using the Archimedean method. On the basis of the determined density values the molar volume, partial molar volume, and excess molar volume of the melts were calculated. In the boundary system KF-K₂NbF₇ the congruently melting compound K₃NbF₈ is formed. This compound exhibits a low thermal stability and at melting it undergoes a thermal dissociation. The degree of the thermal dissociation was calculated on the basis of both the thermal analysis of the phase diagram and the volume properties of the investigated system. It was found that the degree of the thermal dissociation of K₃NbF₈ at the melting point attains the value alpha (0) = 0.44.

Full paper in Portable Document Format: 545a272.pdf

Chemical Papers 54 (5) 272–276 (2000)